/usr/share/php/Horde/ is in php-horde-itip 2.1.1-1ubuntu1.
This file is owned by root:root, with mode 0o755.
..
/usr/share/php/Horde/Itip/
/usr/share/php/Horde/Itip.php
/usr/share/php/Horde/Itip/Event/
/usr/share/php/Horde/Itip/Event.php
/usr/share/php/Horde/Itip/Event/Vevent.php
/usr/share/php/Horde/Itip/Event/Vtodo.php
/usr/share/php/Horde/Itip/Exception.php
/usr/share/php/Horde/Itip/Resource/
/usr/share/php/Horde/Itip/Resource.php
/usr/share/php/Horde/Itip/Resource/Base.php
/usr/share/php/Horde/Itip/Resource/Identity.php
/usr/share/php/Horde/Itip/Response/
/usr/share/php/Horde/Itip/Response.php
/usr/share/php/Horde/Itip/Response/Options/
/usr/share/php/Horde/Itip/Response/Options.php
/usr/share/php/Horde/Itip/Response/Options/Base.php
/usr/share/php/Horde/Itip/Response/Options/Horde.php
/usr/share/php/Horde/Itip/Response/Options/Kolab.php
/usr/share/php/Horde/Itip/Response/Type/
/usr/share/php/Horde/Itip/Response/Type.php
/usr/share/php/Horde/Itip/Response/Type/Accept.php
/usr/share/php/Horde/Itip/Response/Type/Base.php
/usr/share/php/Horde/Itip/Response/Type/Decline.php
/usr/share/php/Horde/Itip/Response/Type/Tentative.php
/usr/share/php/Horde/Itip/Response/Vtodo.php
/usr/share/php/Horde/Itip/Translation.php